This plugin hasnt been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.

activity_id is the string to use as an index. See the _index table for the existing activity_id strings which you should avoid (comment_approve, login_success, etc). 25 chars max.
*activity_strings* is a description of the activity. It is an array of key/header => value/text.

The key is the small, gray text. It can be left empty. If you want several empty keys, use a different amount of spaces for each one. The spaces are trimmed off.
The value is the black text to be displayed to the right of the key or by itself on a line.

Both the key and value can be normal HTML and are both capable of keywords.

user_data is an optional user object, if you want the user-related keywords to work with other user data other than the logged-in user’s.post_data is an optional post object that enables the post-related keywords.comment_data is an optional comment object that enables the comment-related keywords.

The following keywords are automatically replaced by Activity Monitor. Note that post and comment keywords only work when post_data or comment_data are specified.